Slope Roof To Building

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Slope roof to building.

A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Pitch angle incline slope they all can be used to refer to the steepness of a roof. In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. The way pitch also known as roof slope is measured is rise over run.

Built up roofs must have a design roof slope of 1 4 12 or greater 2 slope. Roof pitch is the measurement of roof steepness. The roofslope auxiliary sloping compound provides a quick and easy way to fill in low spots on flat roofs and achieve positive slope to aid in proper drainage. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.

So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12. Coal tar built up roofs however can have a design roof slope of 1 8 12 1 percent but no less. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.